Pseudoptera subtortuosa

Geological context: Late Cretaceous, Fox Hills Fm, Timber Lake Mbr. Collection locality: float and in place, includes many concs., from Sphenodiscus Layer up through CAZ, road cut and adjacent outcrops along W side of SD Rt. 63, from High Elk Hill to point .5 mi N, & between 5.5 and 6 mi S of intersection with US Rt. 212, High Elk Hill, 6 mi SSW of Eagle Butte village, Ziebach County, South Dakota, USA. Collected by Karl M. Waage, 1940/1941. IP number 312572; lot count 1; taphonomy=concretion; accn=IPA.07048; associatedwith=on same slab: IP.312572,IP.312584,IP.312583,IP.312582,IP.312581,IP.312580,IP.312578,IP.312577,IP.312575,IP.312574,IP.312382,IP.312381,IP.312380,IP.312379,IP.312378,IP.312377,IP.312376,IP.312375,IP.312374,IP.312373,IP.312372,IP.312592,IP.312590,IP.312589,IP.312588,IP.312587,IP.312586,IP.312585,IP.312368,IP.312369,IP.312370,IP.312371,IP.312573,IP.312576,IP.312579,IP.312591,IP.312593.